What exactly do you mean by scrolling text? Anyways, to clear text you can either use CLS, which clears the entire console, or print spaces over the text. The second method works best to "erase" certain portions of the console.
What I mean by scrolling text is like how in most RPGs the letters in dialogue show up on screen one by one, hence why I showed a picture of what I was trying to accomplish
Refer to my screenshot. It's best to write text one character at a time using a custom user-defined function, in this case the function SCRLL, as writing it manually would take a considerable amount of extra code and patience.
Feel free to use and modify the function in my screenshot.
That's just a comment. Comments are pieces of text ignored by the program (they don't do anything) and are used to document your code. You can write comments with the ' symbol, which is green and appears in the bottom-right of the SB keyboard.
You can change the colors of everything in the Options menu. All I did was change the comment color to be gray. As of 3.3.0 changing colors is bugged and simply doesn't work, however. The comment contains a function simply because I wanted to write it for reference. (AKA easy to read documentation.)